/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 * @filename  curdate.cc
 */

#include "server_includes.h"
#include CSTDINT_H
#include "function/time/curdate.h"
#include "tztime.h"
#include "temporal.h"
#include "session.h"

void Item_func_curdate::fix_length_and_dec()
{
  collation.set(&my_charset_bin);
  decimals=0;
  max_length=MAX_DATE_WIDTH*COLLAPSAR_CHARSET_BIN_MB_MAXLEN;

  store_now_in_TIME(&ltime);

  /* We don't need to set second_part and neg because they already 0 */
  ltime.hour= ltime.minute= ltime.second= 0;
  ltime.time_type=  COLLAPSAR_TIMESTAMP_DATE;

  /**
   * @TODO Remove ltime completely when timezones are reworked.  Using this
   * technique now to avoid a large patch...
   */
  cached_temporal.set_years(ltime.year);
  cached_temporal.set_months(ltime.month);
  cached_temporal.set_days(ltime.day);
}

/**
    Converts current time in time_t to COLLAPSAR_TIME representation for local
    time zone. Defines time zone (local) used for whole CURDATE function.
*/
void Item_func_curdate_local::store_now_in_TIME(COLLAPSAR_TIME *now_time)
{
  Session *session= current_session;
  time_t tmp= session->query_start();

  (void) cached_temporal.from_time_t(tmp);

  now_time->year= cached_temporal.years();
  now_time->month= cached_temporal.months();
  now_time->day= cached_temporal.days();
  now_time->hour= 0;
  now_time->minute= 0;
  now_time->second= 0;
}

/**
    Converts current time in time_t to COLLAPSAR_TIME representation for UTC
    time zone. Defines time zone (UTC) used for whole UTC_DATE function.
*/
void Item_func_curdate_utc::store_now_in_TIME(COLLAPSAR_TIME *now_time)
{
  Session *session= current_session;
  time_t tmp= session->query_start();

  (void) cached_temporal.from_time_t(tmp);

  now_time->year= cached_temporal.years();
  now_time->month= cached_temporal.months();
  now_time->day= cached_temporal.days();
  now_time->hour= 0;
  now_time->minute= 0;
  now_time->second= 0;
}

bool Item_func_curdate::get_temporal(collapsar::Date &to)
{
  to= cached_temporal;
  return true;
}
